show classname instead of teacher name in teacher timetable view

lib/background/widget_background_task.dart

@@ -195,7 +195,10 @@ Future<void> _refresh() async {
 
   final lessons = timetable.entries;
 
-  final connectDouble = await WidgetSync.getConnectDoubleLessons();
+  final [connectDouble, isTeacher] = await Future.wait([
+    WidgetSync.getConnectDoubleLessons(),
+    WidgetSync.getIsTeacher(),
+  ]);
   final dayData = WidgetDataMapper.buildDayData(
     now: now,
     lessons: lessons,
@@ -205,6 +208,7 @@ Future<void> _refresh() async {
     timegrid: timegrid,
     customEvents: customEvents,
     connectDoubleLessons: connectDouble,
+    showClassInsteadOfTeacher: isTeacher,
   );
   final weekData = WidgetDataMapper.buildWeekData(
     now: now,
@@ -215,6 +219,7 @@ Future<void> _refresh() async {
     timegrid: timegrid,
     customEvents: customEvents,
     connectDoubleLessons: connectDouble,
+    showClassInsteadOfTeacher: isTeacher,
   );
 
   await WidgetSync.writeDayData(dayData);